I'm trying to develop a system to record DMX-512 on CD or audio tape using FSK modulation. By now I'm using 2 XR-2206 to generate 2 frequencies one of 1KHz (for 0) and another of 2KHz (for 1). Then I use a 74HC4051 to switch between the two frecuencies (I'm controlling the switch with the DMX-512 signal). All of this seems to work fine, the problem is to decode FSK into DMX-512 again. I think the problem is that I have not found a chip that can decode FSK at 250 Kbaud. Do you have some experience with this ? Maybe you can give me a little help. Thank you very much in advance !!!! Best Regards !